Hitachi Construction Machinery Co., Ltd. (Tokyo JPX 03)
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15인용 특허 :
3
초록▼
A hydraulic circuit system of a construction machine having first and second hydraulic circuit, and a bypass circuit for connecting the first and second circuits together. The first circuit includes a first hydraulic pump and a first valve group having a plurality of directional control valves for c
A hydraulic circuit system of a construction machine having first and second hydraulic circuit, and a bypass circuit for connecting the first and second circuits together. The first circuit includes a first hydraulic pump and a first valve group having a plurality of directional control valves for controlling a flow of hydraulic fluid from the first pump, and the second circuit includes a second hydraulic pump and a second valve group having a plurality of directional control valves for controlling a flow of hydraulic fluid from the second pump. A plurality of actuators are driven by the hydraulic fluid supplied from the first and second pumps through the valves. The bypass circuit includes a bypass line for connecting the first travel valve in series with the second travel valve in a position downstream thereof through the selecting valve. The selecting valve has first and second positions and is normally in the first position to communicate the second travel valve with the other valves of the second group to supply the hydraulic fluid from the second travel valve to the other valves. When the first travel valve and at least one of the other valves of the second group are simultaneously actuated, the selecting valve is switched to the second position to bring the second travel valve into communication with the first travel valve through the bypass line thereby to supply the hydraulic fluid from the second travel valve to the first travel valve.
대표청구항▼
A hydraulic circuit system for a hydraulic excavator equipped with a swing, left and right traveling devices, a boom, an arm, and a bucket, said hydraulic circuit system including a swing actuator, connected to the swing for driving thereof, a first travel actuator connected to one of the left and r
A hydraulic circuit system for a hydraulic excavator equipped with a swing, left and right traveling devices, a boom, an arm, and a bucket, said hydraulic circuit system including a swing actuator, connected to the swing for driving thereof, a first travel actuator connected to one of the left and right traveling devices for driving thereof, a second travel actuator connected to the other of the left and right traveling devices for driving thereof, a boom actuator connected to the boom for driving thereof, an arm actuator connected to the arm for driving thereof, and a bucket actuator connected to the bucket for driving thereof, said hydraulic circuit system comprising first hydraulic circuit means, second hydraulic circuit means and bypass circuit means connecting the first and second hydraulic circuit means together, said first hydraulic circuit means including a first hydraulic pump and a first valve group having a plurality of directional control valves for controlling a flow of hydraulic fluid from said first hydraulic pump, and said second hydraulic circuit means including a second hydraulic pump and a second valve group having a plurality of directional control valves for controlling a flow of hydraulic fluid from said second hydraulic pump, said directional control valves of said first and second valve groups being connected to the associated actuators for driving thereof by the hydraulic fluid supplied from the first and second pumps through the directional control valves, wherein said directional control valves of said first valve group in said first hydraulic circuit means include a first travel directional control valve connected to said first travel actuator for controlling a flow of hydraulic fluid to the first travel actuator, said first travel directional control valve being connected in tandem with the other valves of the first valve group in a position downstream thereof so that the other directional control valves of the first valve group can take priority in receiving a supply of hydraulic fluid from said first hydraulic pump; said directional control valves of said second valve group in said second hydraulic circuit means include a second travel directional control valve connected to said second travel actuator for controlling a flow of hydraulic fluid to the second travel actuator, said second travel directional control valve being connected in series with the other valves of the second valve group in a position upstream thereof through a directional selecting valve so that said second travel directional control valve can directly receive a supply of hydraulic fluid from said second hydraulic pump and supply the same to said second travel actuator or said bypass circuit means and permits the used hydraulic fluid from the second travel actuator to return to the second hydraulic circuit means via said bypass circuit means for reuse; said bypass circuit means includes a first bypass line for connecting the upstream side of said first travel directional control valve in series with said second travel directional control valve at a position downstream thereof through said directional selecting valve; and said directional selecting valve having first and second positions, said directional selecting valve normally taking the first position to communicate said second travel directional control valve with the other valves of said second valve group and permit the used and returned hydraulic fluid from said second travel directional control valve to be supplied to the other valves before returning to a reservoir, said directional selecting valve being switched to the second position, when said first travel directional control valve and at least one of the other valves of said first valve group are simultaneously actuated, to communicate said second travel directional control valve with said first travel directional control valve through said first bypass line and permit the used and returned hydraulic fluid from said second travel directional control valve to be supplied to said first travel directional control valve before returning to a reservoir.
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이 특허에 인용된 특허 (3)
Lohbauer Kenneth R. (Joliet IL), Crossover plural circuit fluid system.
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Wang, Meng (Rachel); Jagoda, Aaron Hertzel; Larish, Chad Anthony; Piyabongkarn, Damrongrit; Danzl, Per William; Mahulkar, Vishal Vijay, Control system for hydraulic system and method for recovering energy and leveling hydraulic system loads.
Duppong Gerald J. ; Brock Knute K. ; Sagaser Thomas M., Valve stack in a mini-excavator directing fluid under pressure from multiple pumps to actuable elements.
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